Chapter Review Questions

The following questions test your knowledge of topics explained in this chapter. You can find the answers to the questions in Appendix A, "Answers to Chapter Review Questions."

1.	If a client picked up a customer service handset and was automatically connected to customer service without dialing any digits, what kind of call would it be? Cisco CallManager-to-Cisco CallManager call PBX-to-PBX call on-net call local call PLAR call
2.	Which configuration parameter would you change to set the dial tone, busy tone, and ringback tone on an FXS port? cptone ring frequency ring cadence description signal
3.	What are the two options for the linecode command on an E1 connection? SF ESF CRC4 AMI B8ZS HDB3
4.	What are the two options for the framing command on a T1 connection? SF ESF CRC4 AMI B8ZS HDB3
5.	What is the purpose of T-CCS? To route calls between PBXs To provide point-to-point connections between PBXs To pass proprietary signaling between PBXs To specify a channel for standards-based call signaling
6.	What is the best time to change default voice port configurations to tune voice quality? Before you set up the network After the network is up and running After two dial peers experience poor quality When there is a network failure
7.	Which command is used to enable residual echo suppression? echo-cancel enable echo-cancel coverage non-linear no echo-cancel enable
8.	Which two of the following are echo cancellation standards? G.114 G.165 G.168 G.400
9.	Which of the following statements best describes when echo occurs? When there is a mismatch in signaling types When impedance mismatches reflect power back to the source When the far-end impedance absorbs the signal When the router processor utilization is too high to run the companding algorithm in a timely manner
10.	Why does echo usually go unnoticed in a traditional telephony network? The volume of the echo is high. The delay between the original voice signal and the echo is low. Traditional telephony networks do not suffer from impedance mismatches. Traditional telephony networks negate inductance through the use of load coils.